CODE | NUCLIDE | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | COMMENTS |
1095243 | 095_Am_243 | ENDF/B-VII | Covariances - BNL, July, 2011: Covariances were adopted from COMMARA-2.0, which were supplied by BNL. Covariances are combination of the uncertainties recommended in the assessment of Ref. [1] and correlation matrices produced by the WPEC Subgroup 26 [2] converted to the AFCI 33-energy group structure. Following the low-fidelity approach, the uncertainties in the low energy region are based on experimental uncertainties of thermal cross sections, uncertainties of the resonance integrals and uncertainty of the scattering radius. In the fast region the initial estimates [2] were obtained using EMPIRE/KALMAN system with default parameterization roughly adjusted to reproduce trends in the experimental data. The KALMAN code was run with default uncertainties assigned to the key model parameters to produce covariances. The assessment [2] modified considerably elastic uncertainties, slightly increased fission uncertainties above 6 MeV, reduced those of inelastic, doubled (n,2n) uncertainties, and essentially confirmed capture and nu-bar uncertainties. [1] V.M. Maslov, P. Oblozinsky, M. Herman [2] D. Rochman, M. Herman, P. Oblozinsky, and S. F. Mughabghab |